"Being a portable MP3 player as well as an SD card reader, I really think that the Mambo does not reach its full potential since Eumax chose not to include a built in USB connector. On another negative note, the Mambo tops out at only USB 1.1 speeds. If you are only planning on using the 128MB of built in memory, than the USB 1.1 speeds may be fine. But for users wishing to access a SD card in the Mambo, the USB 1.1 speeds make huge file transfers a long task."